seed stand的用法和樣例：
例句
- Seed crops are collected from both natural stands and plantations which may have been culled to form seed stands.
種子采自天然林和人工林，兩者都可能是經過去劣留優作為母樹林的。 - This pest is harmful to the main tip of red pine,and influences the timber production rate and timber quality of red pine ,down to seed quantities of mother forests.
此蟲危害紅松主梢，影響紅松的出材率和材質以及母樹林的結實量。
